Process of removing enamel from enameled goods.



UNITED STATES PATENT OFFICE.

GUSTAV SPITZ, OF BR'U'NN, AUSTRIA-HUNGARY, ASSIGNOR T0 GOLDSCHMIDTDETIN= NING- COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

PROCESS OF REMOVING ENAMEL FROM ENAMELED GOODS.

No Drawing.

To all whom it may concern:

Be it known that I, GUSTAV SPITZ, a citizen o-f Austria, and residing atBriinn, Austria-Hungary, have invented a certain new and useful Processof Removing Enamel from Enameled Goods, of which the following is aspecification.

Heretofore it has been the practice to remove the enamel from enameledgoods by treating the latterwith acids or by immersing: them into meltedcaustic alkalis. But when treating the goods with acids, the metal wasstrongly attacked, while the immersion into melted caustic alkalis 'isVery troublesome and expensive andbesides is connected with certaindangers to the 'workmen.

The present process shows none of the above disadvantages and the enamelis so perfectly removed that the goods are immediately ready for beingnewly enameled.

The process consists in that a layer of caustic alkalis or alkalinecarbonates or a mixture of same is brought on the surfaces from whichthe enamel is to be removed which is best to be done in that Way thatthe enameled goods are coated with a pulp-like mass of the materials.The objects covered with this pulp or paste are placed into theenameling furnace and are heated until the mass has melted together withthe enamel. Hereby such an amount of soda is introduced into theinsoluble silicates. and aluminates which are constituting the enamel,that they are transformed into soluble compoundsfas for instanceWater-glass so that the thus altered layer of enamel will easily bedissolvedin hot water.

.The paste which is necessary for the above process is produced forinstance in that way that a solution of caustic soda of about 45- B. ismixed with the screened anhydrous carbonate of soda. This paste isbrought on the enameled goods by means of a pencil, a brush, a thin ironwire or the like and must be spread on the surfaces as equally aspossible.

Specification of Letters Patent.

Application filed May 12, 1910.. Serial No. 560,861.

Patented June 24., 1913.

What I claim is:

1. The process of removing enamel from enameled goods, which consists infirst covering such goods with a paste of caustic alkali, heating thearticles, and then dissolving the formed soluble compounds.

2. The process of removing enamel from enameled goods, which consists infirst covering such goods with a paste of a substance which when heatedacts as a caustic alkali, heating the articles, and then dissolving theformed soluble compounds.

8. The process of removing enamel from enameled goods, which consists infirst covering such goods with a paste containing a mixture of causticalkali and alkali carbonate, heating the articles, and then dissolvingthe formed soluble compounds.

4. The process of removing enamel from enameled goods, which consists incovering such goodswit-h a paste of caustic soda, heating the mass anddissolving the formed soluble compounds by treating the mass with Water.

5. The process of removing enamel from enameled goods, which consists incovering such goods with a paste of a mixture of caustic soda andcarbonate of soda, heating the mass and dissodving the formed solublecompounds by treating the mass with water.

6. The process of removing enamel from enameled goods, which consists incovering such goods with a paste consisting of carbonate of soda mixedwith a concentrated solution of sodium hydroxid, heating the mass anddissolving the formed soluble compounds by treating the mass with water.

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

GUSTAV SPITZ.

